Setting a structure to read only with PCUI lists

Hi all,
I have to set the complete list of pricing conditions to read-only for certain order types. Only quantity on item level should be allowed to change and invoke price changes.
I thought it would be pretty straight forward by using the field group variants functionality but I am starting to wonder if I am on the right track here.
This is what I've done so far
- copied the SAP field group PRC_CONDITIONS_IT to a ZPRC_CONDITIONS_IT
     -included FG PRC_CONDITIONS_IT in ZPRC_CONDITIONS_IT
     -created a new variant ZREADONLY for ZPRC_CONDITIONS_IT with read only set
- set the flag on the Field group ZPRC_CONDITIONS_IT that the variant exist
- generated the layouts correctly
- created class ZCL_CRM_BSP_AM_ITEMPRC_1O with the class CL_CRM_BSP_AM_ITEMPRC_1O as super
     -implemented my own method GET_FIELDGROUP_VARIANT and set 'ZREADONLY ' where appropriate
- changed the MAC for CRMT_BSP_PRC_UI into ZCL_CRM_BSP_AM_ITEMPRC_1O
- changed the application layout and replaced the FG PRC_CONDITIONS_IT with ZPRC_CONDITIONS_IT .
All data is still displaying correctly but....
according to the debugger, the ZPRC10 method is implemented but the method GET_FIELDGROUP_VARIANT is never called neither from the super nor from my ZPRC10.
as a test I've set my default FG ZPRC_CONDITIONS_IT also to read only but that didn't work . Fields are still open for change.
Can we actually set a complete structure to read only / inherited field group or does this have to be done at field level?
Cheers & thanks for your time
Eelco

Hi Felco,
In the method IF_CRM_BSP_MODEL_ACCESS_IL~READ of the class associated with your structure(MAC) you have a parameter ET_FIELD_ATTRIBUTE in this you can mark the fields with this properties:
A     Not Changeable
B     Not Relevant
C     Mandatory Field
Regards.
Manuel

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